Sb-NQR Probe for Multipole Degree of Freedom in the First Pr-Based Heavy-Fermion Superconductor PrOs4Sb12
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We report <SUP>121,123</SUP>Sb nuclear quadrupole resonance (NQR) measurements in the filled-skutterudite superconductor PrOs<SUB>4</SUB>Sb<SUB>12</SUB> in the temperature range of 0.05–30 K. The electric field gradients (EFG), <I>V<SUB>zz</SUB></I> and <I>V<SUB>xx</SUB></I>−<I>V<SUB>yy</SUB></I>, at the Sb site exhibit unusual temperature dependence below 30 K. To explain these features, we discuss the coupling between the Sb nuclear quadrupole moment and Pr 4<I>f</I><SUP>2</SUP>-derived multipole moments. The observed <I>T</I> dependence of EFG is well explained by the CEF pseudo-quartet consisting of Γ<SUB>1</SUB> singlet and Γ<SUB>4</SUB><SUP>(2)</SUP> triplet states in the cubic point group <I>T<SUB>h</SUB></I>. These results, in turn, are indicative of the importance of the coupling between the <SUP>121,123</SUP>Sb quadrupole moments and the hexadecapole moment caused by the pseudo-quartet.
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